KR102112638B1 - Display apparatus - Google Patents

Abstract

The display device includes a display panel having a plurality of pixels, and first to third light source units provided on a rear surface of the liquid crystal panel to provide light having different wavelength bands to the liquid crystal panel. The first light source unit emits yellow light, the second light source unit emits first blue light in a wavelength range of 430 nm to 455 nm, and the third light source unit emits second blue light in a band of 460 nm to 505 nm or more. do.

Description

Display device {DISPLAY APPARATUS}

The present invention relates to a display device, and more particularly, to a display device optimized for a human body clock.

In general, the display device implements full color by a space division type, and for this purpose, red, green, and blue color filters are repeatedly arranged on the display panel in a one-to-one correspondence with each sub-pixel. At this time, the unit combination of the red, green, and blue color filters acts as a minimum unit for color realization, and full color is realized through a difference in transmittance for each sub-pixel of the display panel and a color tone sum of the red green and blue color filters. As described above, since red, green, and blue color filters are arranged with different spaces in the display panel, they are referred to as a space division method.

On the other hand, there is a time division type (time division type or field sequential type) capable of realizing full color at a low manufacturing cost with high transmittance compared to the space division method. In the time division method, color filters are omitted in the display panel, and red, green, and blue light sources respectively emitting red, green, and blue color light are provided in the backlight disposed on the rear surface of the display panel. In addition, the unit frame is divided into three fields that are temporally separated, and red, green, and blue light sources are lit for each field to sequentially implement red, green, and blue color images. Therefore, the observer perceives a full color image in which red, green, and blue color images are combined by physiological visual perception.

An object of the present invention is to provide a display device optimized for a human body clock.

Another object of the present invention is to provide a display device with improved display quality.

A display device according to an aspect of the present invention includes a display panel having a plurality of pixels, and first to third light source units provided on a rear surface of the liquid crystal panel to provide light having different wavelength bands to the liquid crystal panel. . The first light source unit emits yellow light, the second light source unit emits first blue light in a wavelength range of 430 nm to 455 nm, and the third light source unit emits second blue light in a band of 460 nm to 505 nm or more. do.

In the display panel, a first color filter, a second color filter having a different color from the first color filter, and an open portion in which the first and second color filters are not formed are provided in each pixel. The first and second color filters may include red color filters of red color and green color filters of green color, respectively.

In one embodiment of the present invention, the display panel displays a frame-based image composed of a first sub-field and a second sub-field. The first light source unit supplies the yellow light to the display panel during the first sub-field, and at least one of the second light source unit and the third light source unit is the first and second during the second sub-field. At least one of blue light is supplied to the display panel.

In one embodiment of the present invention, the second light source unit and the third light source unit may simultaneously supply the first blue light and the second blue light to the display panel during the second sub-field, respectively.

In one embodiment of the present invention, the second light source unit and the third light source unit may supply the first blue light or the second blue light to the display panel during the second sub-field, respectively.

In one embodiment of the present invention, the light quantity of the second light source unit and the light quantity of the third light source unit provided for each frame may be different.

In one embodiment of the present invention, the second light source unit and the third light source unit may be selectively driven.

In one embodiment of the present invention, the first color filter and the second color filter are sequentially arranged in a first direction, and the open portion is configured to set the first and second color filters in the first direction in each pixel. It may include a first open portion spaced apart and a second open portion spaced apart from the color filters of pixels adjacent to the first color filter in the first direction.

In one embodiment of the present invention, the width of each of the first and second open portions may be smaller than the width of each of the first and second color filters.

In one embodiment of the present invention, the display panel may display a frame-based image composed of first to third subfields. The first light source unit supplies the yellow light to the display panel during the first subfield, and the second light source unit supplies the first blue light to the display panel during the second subfield, and the first The third light source unit may supply the second blue light to the display panel during the third sub-field.

The display device according to the present invention can control whether melatonin is generated by providing blue light of different wavelengths to a user, and thus is optimized for a biological clock. In addition, in the display device according to the present invention, display quality is improved, such as a wide color coordinate area.

1 is a block diagram of a display device according to an exemplary embodiment of the present invention.
2 is a conceptual diagram showing the principle of realizing full color by time / space division.
3A and 3B are exploded perspective views illustrating a full color implementation principle by a time / space division method in the display device of FIG. 2.
4A is a cross-sectional view of FIG. 3A taken along line I-I ', and FIG. 4B is a cross-sectional view of FIG. 3B taken along line II-II'.
5 illustrates color coordinates in a display device according to an exemplary embodiment of the present invention.
6 and 7 are cross-sectional views illustrating operation modes of a second sub-field of a unit frame in other embodiments of the present invention.
8 is a conceptual diagram illustrating a full color implementation principle by a time / space division method in another embodiment of the present invention.
9A and 9B are perspective views illustrating a full color realization principle by a time / space division method in the display device of FIG. 8.
FIG. 10A is a cross-sectional view of FIG. 9A taken along line I-I ', and FIG. 10B is a cross-sectional view of FIG. 9B taken along line II-II'.
11 is a conceptual diagram illustrating a full color implementation principle by a time / space division method according to another embodiment of the present invention.
12A, 12B, and 12C are perspective views illustrating a full color implementation principle by a time / space division method according to an embodiment of the present invention in the display device of FIG. 11.
13A is a cross-sectional view of FIG. 12A taken along the cutting line I-I ', FIG. 13B is a cross-sectional view of FIG. 12B taken along the cutting line II-II', and FIG. 13C is a cutting line III-III 'of FIG. 12C. It is a sectional view cut along.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The problems to be solved by the present invention described above, problem solving means, and effects will be easily understood through the embodiments associated with the accompanying drawings. Each drawing has been partially or simply exaggerated for clarity. In adding reference numerals to the components of each drawing, it should be noted that the same components are shown to have the same reference numerals as possible, even though they are displayed on different drawings. In addition, in describing the present invention, when it is determined that detailed descriptions of related well-known structures or functions may obscure the subject matter of the present invention, detailed descriptions thereof will be omitted.

1 is a block diagram of a display device according to an exemplary embodiment of the present invention.

Referring to FIG. 1, a display device DSP according to an exemplary embodiment of the present invention includes a display panel PNL displaying an image, a gate driving unit GDV driving the display panel PNL and a data driving unit DDV, And a timing controller TCN that controls driving of the gate driver GDV and the data driver DDV.

The display panel is a light-receiving display panel, and in one embodiment of the present invention, a liquid crystal display panel will be described as an example. However, the display panel is not limited thereto, and the display panel may be, for example, a liquid crystal display panel, an electrophoretic display panel, an electrowetting display panel, or a MEMS display panel.

The display panel PNL includes a plurality of gate lines G1 to Gn, a plurality of data lines D1 to Dm, and a plurality of pixels PX. The plurality of gate lines G1 to Gn extend in a row direction and are arranged in a column direction parallel to each other. The plurality of data lines D1 to Dm extend in a column direction and are arranged in a row direction parallel to each other.

Each of the plurality of pixels PX, for example, the pixel PX connected to the first gate line G1 and the first data line D1 includes a thin film transistor Tr and a liquid crystal capacitor Clc.

The thin film transistor Tr includes a gate electrode connected to the first gate line G1, a source electrode connected to the first data line D1, and a drain electrode connected to the liquid crystal capacitor Clc.

The timing controller TCN receives a plurality of image signals RGB and a plurality of control signals CS from the outside of the display device DSP. The timing controller TCN converts the data format of the image signals RGB to meet the interface specification with the data driver DDV, and converts the converted image signals R'G'B 'to the data driver. (DDV). In addition, the timing controller TCN is a data control signal (D-CS, for example, an output start signal, a horizontal start signal, etc.) and a gate control signal (G-CS) based on the plurality of control signals CS. For example, a vertical start signal, a vertical clock signal, and a vertical clock bar signal) are generated. The data control signal D-CS is provided to the data driver DDV, and the gate control signal G-CS is provided to the gate driver GDV.

The gate driver GDV sequentially outputs a gate signal in response to the gate control signal G-CS provided from the timing controller TCN. Accordingly, the plurality of pixels PX may be sequentially scanned row by row by the gate signal.

The data driver DDV converts and outputs the image signals R'G'B 'into data voltages in response to the data control signal D-CS provided from the timing controller TCN. The output data voltages are applied to the display panel PNL.

Accordingly, each pixel PX is turned on by the gate signal, and the turned-on pixel PX receives a corresponding data voltage from the data driver DDV to display an image of a desired gray level.

As illustrated in FIG. 1, the display device DSP according to an exemplary embodiment of the present invention further includes a backlight unit BLU located on a rear surface of the display panel PNL. The backlight unit BLU supplies light from the rear of the display panel PNL. As an example of the present invention, the backlight unit BLU may employ a plurality of light emitting diodes (not shown) as a light source, in which case the plurality of light emitting diodes are in the form of stripes along one direction on the printed circuit board. It may be arranged as or may be arranged in a matrix form.

2 is a conceptual diagram showing the principle of realizing full color by time / space division.

Referring to FIG. 2, the time / space division method includes first and second color filters having different colors in the display panel PNL (shown in FIG. 1) for full color implementation. As an example of the present invention, the first and second color filters may include a red color filter R having a red color and a green color filter G having a green color. When an area corresponding to one pixel is defined as a pixel area PA, the red and green color filters R and G are provided in each pixel area PA. Further, in each pixel area PA, an open portion W is formed in areas where the first and second color filters R and G are not formed. The open portion W may be formed on one side of the red and green color filters R and G. The red color filter R, the green color filter G, and the open portion W may be arranged along one direction A1, but are not limited thereto, and may be arranged in different orders, or different. It may be arranged along the direction.

Meanwhile, the backlight unit BLU (shown in FIG. 1) includes a first light source unit LU1 generating yellow light Ly, a second light source unit LU2 generating first blue light Lb1, and 2 includes a third light source unit LU3 generating blue light Lb2.

The unit frame (1-Frame) is divided into two first and second sub-fields (1-Field, 2-Field) according to temporal order. In the first sub-field (1-Field) section, the first light source unit LU1 is driven to output the yellow light Ly from the backlight unit BLU to be provided to the display panel PNL. Subsequently, at least one of the second light source unit LU2 and the third light source unit LU3 is driven in the second sub-field section, and the first blue light from the backlight unit BLU ( At least one of Lb1) and the second blue light Lb2 is output and provided to the display panel PNL. In an embodiment of the present invention, the first blue light Lb1 and the second blue light from the second light source unit LU2 and the third light source unit LU3 during the second sub-field (2-Field) ( Lb2) is output as an example.

In one embodiment of the present invention, the yellow light (Ly) includes light in a wavelength band corresponding to the red light and green light components in addition to the light in the yellow wavelength band. That is, the wavelength band of the yellow light Ly may have the wavelength band corresponding to the red light and the wavelength band corresponding to the green light. Here, the wavelength band of a predetermined light means a range of a wavelength at which a peak is located in the spectrum of each light.

Accordingly, a red light component of the yellow light Ly generated from the backlight unit BLU during the first sub-field period is displayed as a red image through the first color filter R. , The green light component of the yellow light Ly passes through the second color filter G and is displayed as a green image.

Thereafter, the first blue light Lb1 and the second blue light Lb2 generated from the backlight unit BLU during the second sub-field period pass through the open portion W It is displayed as a blue image.

The first blue light Lb1 and the second blue light Lb2 are both light having a blue color, but have different wavelength bands. When the wavelength band of the first blue light Lb1 is referred to as a first wavelength band and the wavelength band of the second blue light Lb2 is a second wavelength band, the first wavelength band is greater than the second wavelength band. Corresponds to the long wavelength. In one embodiment of the present invention, the first wavelength band is about 460 nm to about 505 nm, and the second wavelength band is about 430 nm to about 455 nm.

Here, the open part W is provided to provide a space in which a blue image can be displayed during the second sub-field. In addition, the open portion W can remove the color separation phenomenon that can occur in the time-division method and increase the luminance, and the size can be determined so as to display an appropriate transmittance in consideration of the luminance or color of the desired frame. .

3A and 3B are exploded perspective views illustrating a full color implementation principle by a time / space division method in the display device of FIG. 2. 4A is a cross-sectional view of FIG. 3A taken along line I-I ', and FIG. 4B is a cross-sectional view of FIG. 3B taken along line II-II'. However, FIGS. 3A and 4A show the operation mode of the first sub-field of the unit frame, and FIGS. 3B and 4B show the operation mode of the second sub-field of the unit frame.

The operation modes of the display panel PNL and the backlight unit BLU change only for each of the first and second sub-fields 1-Field and 2-Field, and the structure of the display panel PNL and the backlight unit BLU Does not change. Therefore, the structures of the display panel PNL and the backlight unit BLU will be described first with reference to FIGS. 3A and 4A.

3A and 4A, the display panel PNL according to an exemplary embodiment of the present invention may have a structure in which red and green color filters R and G are repeatedly arranged in a first direction A1.

Specifically, the display panel PNL includes a first substrate SUB1, a second substrate SUB2 parallel to the first substrate SUB1, and between the first substrate SUB1 and the second substrate SUB2. It consists of an interposed liquid crystal layer (LC).

Although not illustrated, the first substrate SUB1 includes a thin film transistor Tr of each pixel PX (shown in FIG. 1) and a first electrode of the liquid crystal capacitor Clc (ie, Pixel electrode) (not shown) may be provided on the lower substrate. The second substrate SUB2 is provided with at least two color filters R and G in each pixel area PA corresponding to each pixel PX, and the second electrode (that is, the liquid crystal capacitor Clc). , A reference electrode) (not shown) may be provided on the upper substrate. For convenience of description, as illustrated in FIG. 4A, pixels provided on the first substrate SUB1 and reference electrodes provided on the second substrate SUB2 are omitted.

The second substrate SUB2 includes a base substrate BS, red and green color filters R and G provided on the base substrate BS, and edges of the red and green color filters R and G. The formed black matrix (BM), and the red and green color filters (R, G) and an overcoat layer (OC) covering the black matrix (BM).

The base substrate BS is provided with an open portion W in which the red and green color filters R and G are not provided on at least one side of the red and green color filters R and G.

Although not shown in the drawing, each pixel corresponds to a red sub-pixel provided corresponding to the red color filter R, a green sub-pixel provided corresponding to the green color filter G, and an open portion W It may include a provided white sub-pixel. Here, since the white sub-pixel transmits all the light passing through the open portion W, it is referred to as a white sub-pixel for convenience, and does not indicate a white color. Each of the red, green, and white sub-pixels may be independently driven by a thin film transistor and a liquid crystal capacitor.

The overcoat layer (OC) is made of an organic insulating film or the like to cover the red and green color filters (R, G) and the open portion (W). The overcoating layer OC may reduce a step between the area where the color filter is formed and the area where the open portion W is formed.

Meanwhile, the backlight unit BLU includes a first light source unit LU1, a second light source unit LU2, and a printed circuit board (PCB) on which the first and second light source units LU1 and LU2 are mounted. do. In an embodiment of the present invention, the first to third light source units LU1, LU2, and LU3 are shown alternately arranged on the printed circuit board (PCB), but are not limited thereto.

The first light source unit LU1 is a light source that outputs yellow light Ly, and the second light source unit LU2 is a light source that outputs first blue light Lb1, and the third light source unit LU3 is Is a light source that outputs the second blue light Lb2.

3A and 4A, during the first sub-field (1-Field) period, the first light source unit LU1 operates to output the yellow light Ly, but the second light source unit LU2 And the third light source unit LU3 is turned off. In the first sub-field (1-Field) period, the red, green, and white sub-pixels all operate. Accordingly, the yellow light Ly output from the first light source unit LU1 passes through the red and green color filters R, G and the open portion W and is displayed as an image.

3B and 4B, during the second sub-field (2-Field) period, the first light source unit LU1 is turned off, and the second light source unit LU2 and the third light source unit (LU3) operates to output the first blue light Lb1 and the second blue light Lb2, respectively. In the second sub-field (2-Field) period, the red and green sub-pixels do not operate, but the white sub-pixel operates. Therefore, the first blue light Lb1 and the second blue light Lb2 output from the second light source unit LU2 and the third light source unit LU3 are the red and green color filters R, G ) Does not pass, and passes through the open portion W and is displayed as a blue image.

As described above, the display device according to an exemplary embodiment of the present invention implements full color by a time / space division method, thereby improving display quality and response speed.

In addition, in the display device according to the exemplary embodiment of the present invention, the second and second blue lights affect whether or not melatonin is produced by a person who is a user. In particular, in the case of blue light having a wavelength band around 464 nm, it is known to suppress the production of the melatonin. The melatonin is a type of hormone synthesized in the body, and is synthesized from the pineal gland and secreted into the blood. The melatonin is a substance that induces depression when the amount of synthesis in the body is large or maintained for a long time in the body. This can be found in Appollo Health's "Understanding How Wavelengths Affect Circadian Rhythms". In one embodiment of the present invention, in the case of the first blue light including a wavelength band of about 464 nm, the effect of suppressing the production of melatonin is large.

In an embodiment of the present invention, when using a blue light having a center wavelength of 454 nm and a blue light having a center wavelength of 464 nm, clinically testing the inhibitory effect of melatonin, when using a blue light having a center wavelength of 464 nm, The amount of melatonin produced was reduced compared to the case where blue light having a central wavelength of 454 nm was used, resulting in about 0.71 fold of melatonin. In addition, as a result of measuring the time at which the melatonin in the body becomes 12.5 pg / mL using the same amount of light, blue light having a center wavelength of 454 nm and blue light having a center wavelength of 464 nm, as compared with the case of blue light having a center wavelength of 454 nm In the case of blue light having a central wavelength of 464 nm, the point of time at 12.5 pg / mL was delayed for about 3 hours, and the maximum secretion amount was also about half.

In one embodiment of the present invention, using the same light amount of blue light having a central wavelength of 454 nm and blue light having a central wavelength of 464 nm, the starting point of melatonin secretion (DLMO: dim light melatonin onset) in the body is 20% of the maximum value. When measured based on the corresponding threshold, 46 minutes was delayed for blue light having a central wavelength of 464 nm, compared to blue light having a central wavelength of 454 nm. In addition, when measured based on a threshold value corresponding to 50% of the maximum value, 51 minutes was delayed in the case of blue light having a central wavelength of 464 nm than in the case of blue light having a central wavelength of 454 nm.

As described above, in the case of blue light having a relatively long center wavelength, it can be confirmed that the amount of melatonin produced is suppressed. In an embodiment of the present invention, the second light source unit and the third light source unit that emit the first blue light Lb1 and the second blue light Lb2 are selectively driven to adjust the wavelength band of the blue light. By controlling the production and inhibition of melatonin.

To this end, either one of the second light source unit and the third light source unit may be driven, or both may be driven, and the amount of light of each of the first blue light Lb1 and the second blue light Lb2 is also the same or It can be set differently. Whether the second light source unit and the third light source unit are driven may be automatically selected according to an order set in the display device, or randomly without a set order, or alternatively, may be selected by a user. As a result, according to an embodiment of the present invention, the production and suppression of the melatonin are easily controlled, thereby providing a display device optimized for a human bio-clock.

In addition, the display device according to an exemplary embodiment of the present invention is extended in color coordinates by using the first blue light Lb1 and the second blue light Lb2 having different wavelength bands, and is advantageous in controlling color coordinates when displaying an image. .

5 illustrates color coordinates in a display device according to an exemplary embodiment of the present invention. In FIG. 5, the color coordinate according to the case of using the first blue light is E1, and the color coordinate according to the case of using the second blue light is represented by E2.

Table 1 shows the x and y coordinates of the first blue light and the second blue light in FIG. 5.

Color coordinate x y standard 0.141 0.048 1st blue light 0.133 0.065 2nd blue light 0.146 0.039

Referring to FIG. 5 and Table 1, there is a difference in color coordinate areas when using the first blue light and when using the second blue light, by selectively using the first blue light and the second blue light. The color coordinate area can be widened.

As described above, in the display device according to the embodiments of the present invention, the first blue light and the second blue light may be selectively provided on the display panel. 6 and 7 are cross-sectional views illustrating operation modes of a second sub-field of a unit frame in other embodiments of the present invention. In other embodiments shown in FIGS. 6 and 7, since the operation mode of the first sub-field of the unit frame is substantially the same as that of the above-described embodiment, description thereof is omitted.

Referring to FIG. 6, unlike the embodiment of the present invention in which the second light source unit and the third light source unit are simultaneously driven in the second sub-field, in another embodiment of the present invention, only the second light source unit LU2 is driven. Can be. The first and third light source units LU1 and LU3 are not driven. Referring to FIG. 7, only the third light source unit LU3 may be driven in the second sub-field. The first and second light source units LU1 and LU2 are not driven.

In another embodiment of the present invention, the pixel area of the display device may be provided in various ways. 8 is a conceptual diagram illustrating a full color implementation principle by a time / space division method in another embodiment of the present invention. Hereinafter, in the display device according to still other embodiments, for convenience of description, differences from one embodiment of the present invention will be mainly described, and omitted parts are according to one embodiment of the present invention.

Referring to FIG. 8, when an area corresponding to one pixel is defined as a pixel area PA, the red and green color filters R and G are provided in each pixel area PA. In addition, first and second open portions W1 and W2 are formed in each pixel area PA. The first open portion W1 is formed between the red and green color filters R and G, and the second open portion W2 is one side of any one of the red and green color filters R and G. Is formed on.

Meanwhile, the backlight unit BLU (shown in FIG. 1) includes a first light source unit LU1 generating yellow light Ly and a second light source unit LU2 generating first blue light Lb1 and 2 includes a third light source unit LU3 generating blue light Lb2.

The unit frame (1-Frame) is divided into two first and second sub-fields (1-Field, 2-Field) according to temporal order.

In the first sub-field (1-Field) section, the first light source unit LU1 is driven to output the yellow light Ly from the backlight unit BLU to be provided to the display panel PNL.

Subsequently, at least one of the second light source unit LU2 and the third light source unit LU3 is driven in the second sub-field section, and the first blue light from the backlight unit BLU ( At least one of Lb1) and the second blue light Lb2 is output and provided to the display panel PNL.

During the first sub-field (1-Field) period, a red light component of the yellow light (Ly) generated from the backlight unit (BLU) passes through the first color filter (R) and is displayed as a red image. The green light component of the yellow light Ly passes through the second color filter G and is displayed as a green image.

Subsequently, the first blue light Lb1 and the second blue light Lb2 generated from the backlight unit BLU during the second sub-field period are the first and second open parts ( W1, W2) and displayed as a blue image.

As such, the first and second open units W1 and W2 are provided to provide a space in which a blue image can be displayed during the second sub-field section. In addition, the first and second open portions W1 and W2 may remove color separation phenomena that may occur in the time-division method and increase luminance, and may exhibit appropriate transmittance in consideration of luminance or color of a desired frame. So that the size can be determined.

9A and 9B are perspective views illustrating a full color realization principle by a time / space division method in the display device of FIG. 8. FIG. 10A is a cross-sectional view of FIG. 9A taken along line I-I ', and FIG. 10B is a cross-sectional view of FIG. 9B taken along line II-II'. However, FIGS. 9A and 10A show the operation mode of the first sub-field of the unit frame, and FIGS. 9B and 10B show the operation mode of the second sub-field of the unit frame.

9A and 10A, the red and green color filters R and G are arranged to be spaced apart at a predetermined distance in the first direction A1 by the first open part W1, and thus the red and green colors The filters R and G do not overlap each other. In addition, the green color filter G has a predetermined interval in the first direction A1 by the red color filter (not shown) of the pixels adjacent to the first direction A1 and the second open part W2. Spaced apart. As described above, since the color filters are spaced apart by the first and second open portions W1 and W2, the overlapping portions of the color filters can be eliminated, and as a result, liquid crystal spreading occurring in the overlap portion is prevented. can do.

The overcoat layer (OC) is formed of an organic insulating film, and the like, thereby covering the red and green color filters (R, G), the first and second open parts (W1, W2), and the region where the color filter is formed and the first And planarization between the regions where the second open portions W1 and W2 are formed. When viewed on a plane, areas of the first and second open parts W1 and W2 may be equal to or smaller than areas of the red and green color filters R and G, respectively. Alternatively, the width of the first and second open portions W1 and W2 when viewed from a plane may be smaller than the width of the red color filter R and the green color filter G.

During the first sub-field (1-Field) period, the first light source unit LU1 operates to output the yellow light Ly, but the second light source unit LU2 and the third light source unit LU3 Is turned off.

In the first sub-field (1-Field) period, the red, green, and white sub-pixels all operate. Therefore, the yellow light Ly output from the first light source unit LU1 passes through the red and green color filters R and G and the first and second open parts W1 and W2 to form an image. Is displayed.

9B and 10B, during the second sub-field (2-Field) period, the first light source unit LU1 is turned off, the second light source unit LU2, and the third light source The unit LU3 operates to output the first blue light Lb1 and the second blue light Lb2, respectively.

In addition, in the second sub-field (2-Field) period, the red and green sub-pixels do not operate, but the white sub-pixel operates. Therefore, the first blue light Lb1 and the second blue light Lb2 output from the second light source unit LU2 and the third light source unit LU3 are the red and green color filters R, G ) Does not pass and passes through the first and second open parts W1 and W2 and is displayed as a blue image.

In another embodiment of the present invention, the first light source unit and the second light source unit may be individually driven in different sub-field sections. 11 is a conceptual diagram illustrating a full color implementation principle by a time / space division method according to another embodiment of the present invention.

Referring to FIG. 11, when an area corresponding to one pixel is defined as a pixel area PA, the red and green color filters R and G are provided in each pixel area PA. In addition, first and second open portions W1 and W2 are formed in each pixel area PA. The first open portion W1 is formed between the red and green color filters R and G, and the second open portion W2 is one side of any one of the red and green color filters R and G. Is formed on.

Meanwhile, the backlight unit BLU (shown in FIG. 1) includes a first light source unit LU1 generating yellow light Ly and a second light source unit LU2 generating first blue light Lb1 and 2 includes a third light source unit LU3 generating blue light Lb2.

The unit frame (1-Frame) is divided into two first to third sub-fields (1-Field, 2-Field, 3-Field) according to temporal order. In the first sub-field (1-Field) section, the first light source unit LU1 is driven to output the yellow light Ly from the backlight unit BLU to be provided to the display panel PNL. In the second sub-field (1-Field) section, the second light source unit LU2 is driven to output the first blue light Lb1 from the backlight unit BLU to be provided to the display panel PNL. . In the third sub-field (3-Field) section, the third light source unit LU3 is driven to output the second blue light Lb2 from the backlight unit BLU to be provided to the display panel PNL.

12A, 12B, and 12C are perspective views illustrating a full color implementation principle by a time / space division method according to an embodiment of the present invention in the display device of FIG. 11. 13A is a cross-sectional view of FIG. 12A taken along the cutting line I-I ', FIG. 13B is a cross-sectional view of FIG. 12B taken along the cutting line II-II', and FIG. 13C is a cutting line III-III ' It is a sectional view cut along. However, FIGS. 12A and 13A show the operation mode of the first sub-field of the unit frame, FIGS. 12B and 13B show the operation mode of the second sub-field of the unit frame, and FIGS. 12C and 13C show the first operation of the unit frame. 3 indicates the operation mode of the sub-field.

12A and 13A, while the first light source unit LU1 operates to output the yellow light Ly during the first sub-field (1-Field) period, the second light source unit LU2 And the third light source unit LU3 is turned off. Therefore, the yellow light L1 outputted from the first light source unit LU1 includes the red color filter R, the green color filter G, and the first and second open parts W1 and W2. Transmitted and displayed as an image. In this case, the red sub-pixel, the green sub-pixel, and the first and second white sub-pixels may be individually driven to implement a red image, a green image, or a yellow image depending on whether each sub pixel operates.

12B and 13B, during the second sub-field (2-Field), the second light source unit LU2 operates to output the first blue light Lb1, but the first light source unit LU1 ) And the third light source unit LU3 are turned off.

In the second sub-field (2-Field) period, the red sub-pixel, the green sub-pixel, and the second white sub-pixel do not operate, but the first white sub-pixel operates. Therefore, the first blue light Lb1 output from the second light source unit LU2 does not pass through the red color filter R, the green color filter G, and the second open part W2. Only the first open portion W1 is transmitted and displayed as a blue image in the first wavelength band.

Referring to FIGS. 12C and 13C, the third light source unit LU3 operates during the third sub-field section to output the second blue light Lb2, but the first light source unit LU1 ) And the second light source unit LU2 are turned off.

In the third sub-field section, the red sub-pixel, the green sub-pixel, and the first white sub-pixel do not operate, but the second white sub-pixel operates. Therefore, the second blue light Lb2 output from the third light source unit LU3 does not pass through the red color filter R, the green color filter G, and the first open part W1, Only the second open portion W2 is transmitted and displayed as a blue image in the second wavelength band.

Although described with reference to the above embodiments, those skilled in the art understand that various modifications and changes can be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. Will be able to.

For example, within the limits that do not impair the concept of the present invention, in addition to the wavelength band of the blue light suggested in the embodiments of the present invention, an extreme wavelength blue light of 430 nm or less may be additionally included.

Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, and all technical spirit within the scope of the following claims and equivalents thereof should be interpreted as being included in the scope of the present invention. something to do.

PNL: Display panel GDV: Gate driver
DDV: Data driver TCN: Timing controller
BLU: backlight unit LU1: second light source unit
LU2: Second light source unit LU3: Third light source unit
DSP: Display

Claims (12)

A display panel having a plurality of pixels; And
It includes first to third light source units provided on the rear surface of the display panel to provide light having different wavelength bands to the display panel,
The first light source unit emits yellow light, the second light source unit emits first blue light in a wavelength range of 430 nm to 455 nm, and the third light source unit emits second blue light in a wavelength range of 460 nm to 505 nm. Display device. According to claim 1,
In the display panel, a display device including a first color filter, a second color filter having a different color from the first color filter, and an open portion in which the first and second color filters are not formed in each pixel. According to claim 2,
The first and second color filters include a red color filter of red color and a green color filter of green color, respectively. According to claim 2,
The display panel displays a frame-based image composed of a first sub-field and a second sub-field,
The first light source unit supplies the yellow light to the display panel during the first sub-field, and at least one of the second light source unit and the third light source unit is the first and second during the second sub-field. A display device that supplies at least one of blue light to the display panel. The method of claim 4,
The second light source unit and the third light source unit respectively display the first and second blue light during the second sub-field to the display panel. The method of claim 5,
A display device in which the amount of light of the second light source unit and the amount of light of the third light source unit provided for each frame are different. The method of claim 4,
The second light source unit and the third light source unit are selectively driven display device. The method of claim 7,
The second light source unit and the third light source unit are alternately driven in correspondence with each frame. The method of claim 4,
Each pixel includes first and second sub-pixels respectively provided in correspondence to the first and second color filters, and third sub-pixels provided in correspondence to the open portion,
The first to third sub pixels are individually driven. According to claim 2,
The first color filter and the second color filter are sequentially arranged in a first direction, and the open portion includes a first open portion and the first spaced apart first and second color filters within each pixel in a first direction. A display device including a second open part that separates a second color filter from a color filter of pixels adjacent to the first direction. The method of claim 10,
The width of each of the first and second open portions is smaller than the width of each of the first and second color filters. The method of claim 10,
The display panel displays a frame-based image composed of first to third subfields,
The first light source unit supplies the yellow light to the display panel during the first subfield, and the second light source unit supplies the first blue light to the display panel during the second subfield, and the first The 3 light source unit displays the second blue light during the third sub-field to the display panel.

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